Although this is my first post I'm going to skip and give my info because I have tried all the other suggestions (Delete and reinstall, select video quality man., change output location, restart Real Downloader) and i'm forgetting some of them i'm sure, but I still cannot download videos from YouTube.
So a few days ago I downloaded RealPlayer Plus and I was able to download many videos from YouTube, this worked for about 2 days and then it stopped working, the "Download This Video" tab began to say what its saying to everyone else "No Videos To Download On This Page".
After fiddling with all the suggestions iv'e been able to download maybe two vids. since then, anyway heres my info: (1) RealPlayer Ver. 188.8.131.524, (2) Chrome Ver. 58.0.3029.81, (3) FireFox Ver. 53.0.(32-Bit), (4) Internet Explorer Ver, 11.1066.14393.0, and (4) Windows 10 64-Bit, with antivirus Kaspersky Total Security, Grateful for any help.